title: Structural characterization and in vitro antitumor activity of a novel polysaccharide isolated from the fruiting bodies of Pleurotus ostreatus.
abstract: A novel water-soluble polysaccharide (POPS-1) was obtained from the fruiting bodies of Pleurotus ostreatus by hot water extraction, ethanol precipitation, and fractionated by DEAE-cellulose ion exchange chromatography and sepharose CL-6B gel filtration chromatography using an ATKA explore 100 purifier. The structure characterization and antitumor activity of the POPS-1 were evaluated in this paper. According to GC analysis, HPGPC, FT-IR, partial acid hydrolysis, periodate oxidation and Smith degradation, methylation and GC-MS analysis, the results indicate POPS-1 (M(w)=31 kDa) was composed of Man; Gal; Glc with a molar ratio of 1:2.1:7.9, it had a backbone of beta-(1-->3)-linked glucose residues, which occasionally branches at O-6. The branches were composed of (1-->3)-linked Glc, (1-->4)-linked Gal, (1-->4)-linked Man, and terminated with Glc and Gal residues. Cytotoxicity assay showed POPS-1 presented significantly higher antitumor activity against Hela tumor cell in vitro, in a dose-dependent manner, and exhibited significantly lower cytotoxicity to human embryo kidney 293T cells than Hela tumor cells compared with 5-Fu. The results suggest POPS-1 may be considered as a potential candidate for developing a novel low toxicity antitumor agent.
authors.affiliation: Life Science Research Center, Beihua University, Jilin 132013, China. tonghaibin@gmail.com
authors.forename: Haibin
authors.initials: H
authors.lastname: Tong
authors.forename: Fengguo
authors.initials: F
authors.lastname: Xia
authors.forename: Kai
authors.initials: K
authors.lastname: Feng
authors.forename: Guangren
authors.initials: G
authors.lastname: Sun
authors.forename: Xiaoxv
authors.initials: X
authors.lastname: Gao
authors.forename: Liwei
authors.initials: L
authors.lastname: Sun
authors.forename: Rui
authors.initials: R
authors.lastname: Jiang
authors.forename: Dan
authors.initials: D
authors.lastname: Tian
authors.forename: Xin
authors.initials: X
authors.lastname: Sun
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D016923:Cell Death / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D048690:Fruiting Bodies, Fungal / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006367:HeLa Cells; D006801:Humans; D006868:Hydrolysis / Q000187:drug effects; D010084:Oxidation-Reduction / Q000187:drug effects; D020076:Pleurotus / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D011134:Polysaccharides